collision of the primary ion can be re-attracted to the insulator. This electron current source negatively polarizes the insulator locally and makes the primary ion collide there with the luminosity. Further, we can associate the electron hopping effect with the mechanism of the plasma-induced discharge of the negatively biased solar cells. When the ion sheath overhangs the insulator much more, the electron from the conductor can multi-hop and make an avalanche due to the secondary electron emission coefficient, y5, for electron collision with the insulator which is over unity. In addition to the secondary
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